Why do all ACT race discs come with a rigid hub?
The major purpose of springs in the hub of the clutch disc is to dampen out the torsional vibrations of the engine in order to quiet down the transmission noises under no load conditions. In racing, few people worry about noise. With the aggressive engagement of the friction materials used on the race disc chatter is a concern. If our discs were dampened, chatter would be worse from the extra wind-up affect of the dampeners. Without hub dampeners you will have less chatter, faster shifting due to the lighter weight and less to go wrong.
